\\[-1.8ex] Soil Heterogeneity & $-$0.291$^{*}$ & $-$0.230 & $-$0.230 & $-$0.231 & $-$0.232 & $-$0.231 & $-$0.230 \\ 
  & (0.169) & (0.158) & (0.157) & (0.157) & (0.157) & (0.157) & (0.156) \\ 
\\[-1.8ex] 
Observations & 12,410 & 12,410 & 12,410 & 12,410 & 12,410 & 12,410 & 12,410 \\ 
R$^{2}$ & 0.581 & 0.585 & 0.585 & 0.585 & 0.585 & 0.585 & 0.585 \\ 
